For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningDanger, Warnings, and Cautions
Warning messages found on vehicle labels and in this manual describe hazards
and what to do to avoid or reduce them.
Danger indicates a hazard with a high level of risk which will result in serious
injury or death.
Warning or Caution indicates a hazard that could result in injury or death.
WA ...
Scrapping Procedure
During the course of a vehicle's useful life, certain situations may arise
which will necessitate the disposal of a live (undeployed)
pretensioner. The following information covers the proper procedures for the
disposing of a live (undeployed) pretensioner. Deploy the
pretensioner before dispo ...
Steering Gear Replacement (Hydraulic Power Steering)
Special Tools
EN 45059 Torque Angle Sensor Kit
For equivalent regional tools, refer to Special Tools.
Removal Procedure
Turn the front wheels to the straight forward position and secure the
steering wheel from moving.
Remove the lower steering intermediate shaft bolt (1).
...